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Acquisition of Orlaco (Narrative) (Details) - Orlaco [Member]
€ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2017
EUR (€)
Jan. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]                
Acquisition agreement date         Jan. 31, 2017      
Total cash paid at closing € 74,939 $ 79,675,000            
Acquisition related costs         $ 0 $ 1,259,000    
Expense related to fair value adjustment for earn-out consideration     $ 0 $ 1,823,000 $ 369,000 3,926,000    
Earnout Consideration [Member]                
Business Acquisition [Line Items]                
Maximum additional earnout consideration             € 7,500 $ 8,706,000
Fair Value Adjustment to Inventory [Member]                
Business Acquisition [Line Items]                
Expense related to inventory fair value step up       $ 0   $ 1,636,000